Grade 12 Science 2015 Quiz

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Created on August 04, 2020

G12 Science 2015

2. The velocity time graph for the motion of a trolley is shown below.

1 / 40

The diagram below shows part of the micrometre screw gauge.
What is the reading shown in the diagram?

6.69 mm

6.86 mm

6.68 cm

5.68 mm

2 / 40

The velocity time graph for the motion of a trolley is shown below.

200m

320m

400m

520m

3 / 40

Which of the following quantities changes when a body is accelerating?

Mass of the body.

Weight of the body.

Velocity of the body.

The force acting on the body.

4 / 40

03N

05N

12N

5 / 40

03N

05N

12N

6 / 40

A toy car of mass 600g moves through 6m in 2 seconds.
The average kinetic energy of the toy car is ....

0.027J

0.27J

2.7J

66.67J

7 / 40

The diagram below shows an inclined plane used to lift a load of 2000N.

40.0

20.0

2.0

0.5

8 / 40

Which of the following processes shows that particles of matter are in a random
motion?

A small drop of oil spreads into a large circular patch on water.

Particles of smoke are seen to move haphazardly.

Bromine gas spreads slowly into a vacuum.

Particles of smoke are seen to move in one direction only.

9 / 40

Which of the following describes the difference between x-rays and gamma rays?

Gamma rays and x-rays have different sources.

Gamma rays travel faster than x-rays.

Gamma rays have a longer wavelength than x-rays.

Gamma rays do not affect photographic films.

10 / 40

A ripple tank with a vibrator hitting the surface of water with a frequency of 60Hz
produces 10 complete waves in a distance of 15 cm.
What is the velocity of the water waves produced?

0.9m/s

9m/s

90m/s

900m/s

11 / 40

When a sound wave passes through air, the particles of air ....

oscillate perpendicular to the direction of the wave.

oscillate parallel to the direction of the wave.

oscillate up and down.

do not move at all.

12 / 40

A ray of light from a ray box is directed on one side of a parallel sided glass block.

13 / 40

The diagram below shows a soft iron rod placed inside a solenoid connected to a
d.c supply. The ends of the soft iron rod are marked X and Y.

X attracts pieces of iron filings.

X becomes the South Pole.

Y becomes the North Pole.

Y does not attract pieces of iron filings.

14 / 40

15 / 40

A battery moves a charge of 60c around a circuit at a constant rate in 20 seconds.
What is the current flowing in the circuit?

80A

40A

3.0A

0.3A

16 / 40

A heater is connected to a 200V supply.
If the heating element has a resistance of 10Ω, how much electrical energy is
supplied to the heater in 2 minutes?

800 000J

480 000J

8 000J

4 000J

17 / 40

The diagram below shows an ideal transformer which is supplied with an
alternating voltage of 240V and a current of 1A.
If the secondary current is 5A, what is the secondary voltage?

1400V

1200V

240V

48V

18 / 40

19 / 40

Which of the following radiations is NOT deflected by an electric field?

Alpha

Beta

Gamma

Proton

20 / 40

21 / 40

22 / 40

Of the techniques below, which one can be used to separate cellular components of
blood from blood plasma?

Centrifugation

Chromatography

Distillation

Filtration

23 / 40

Element X has an electronic configuration 2, 8, 8, 1 while that of Y is 2, 8 , 6.
Which one of the following is true about the compound formed between X and Y?

Covalent compound of formula X2Y.

Covalent compound of formula XY2.

Ionic compound of formula XY2.

Ionic compound of formula X2Y.

24 / 40

Which one of the following contains a set of three elements?

Argon, Lime, Water.

Potassium, Graphite, Nitrogen.

Silica, Oxygen, Hydrogen

Copper, Petrol, Alcohol .

25 / 40

How many atoms are there in 6.0g of carbon atoms?

3 x 10²3;

6 x 10²3;

1.2 x 10²4;

6 x 10²4;

26 / 40

12.0dm³

24.0dm³

48.0dm³

120dm³

27 / 40

28 / 40

In the Periodic Table hydrogen (H) is not placed in any of the Groups.
Which of the following is the best explanation for its position? It ....

has no neutrons.

is the lightest of all the elements.

has properties of both Group I and Group VII elements.

has only one electron in its only single energy level.

29 / 40

One physical property of all metals is that they are all ....

hard with high melting points.

reactants forming coloured compounds.

never found native.

good electrical conductors.

30 / 40

31 / 40

Which ions form the net ionic equation when aqueous solutions of ethanoic acid
and sodium hydroxide react together?

Ethanoate ions and sodium ions.

Ethanoate ions and hydroxide ions.

Hydrogen ions and hydroxide ions.

Hydrogen ions and sodium ions.

32 / 40

A solution of pH less than 7 is ....

acidic.

amphoteric.

basic.

neutral.

33 / 40

Which one of the following salts can be suitably prepared by precipitation method?

BaSO4

BaCl2

Ba(NO3)2

Pb(NO3)2

34 / 40

Which one of the following compounds contains two elements essential to plant
growth?

Ammonium nitrate

Potassium nitrate

Potassium sulphate

Sodium phosphate

35 / 40

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39 / 40

Which of the following processes involves formation of small molecules from large
molecules?

Formation of starch from glucose.

Polymerisation of ethene.

Hydrogenation of ethene.

Fermentation of sugar.

40 / 40

Which compound is formed by reacting ethene with steam in the presence of hot
phosphoric acid catalyst?

Ethane

Ethanol

Propane

Propanol

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